Why Tie a Product Consumers Do Not Use?
研究了垄断者捆绑消费者不使用的互补品，通过从竞争对手转移利润获利，并分析了其社会效率与反垄断含义。
We provide an explanation for tying not based on any of the standard arguments: efficiency, price discrimination, or exclusion. In our analysis a monopolist ties a complementary good to its monopolized good, but consumers do not use the tied good. The tie is profitable because it shifts profits from a complementary good rival to the monopolist. We show such tying is socially inefficient, but arises only when the tie is socially efficient in the absence of the rival. We relate this form of tying to several examples, discuss how it can also arise under competition, and explore its antitrust implications.